#include <iostream>
using namespace std;
int main()
{
	int c,s;
	float p,w,d,f;
	cout<<"Please enter p,w,s:"<<'\n';
	cin>>p>>w>>s;
	if (s >=3000) c =12;
	else c =s/250;
	switch(c)
	{
		case 0 : d =0; break;
		case 1 : d =2; break;
		case 2 :  
		case 3 : d =5; break;
		case 4 : 
		case 5 : 
		case 6 :
		case 7 : d =8; break;
		case 8 : d =0; break;
		case 9 : 
		case 10 :
		case 11 : d =10; break;
		case 12 : d =15; break;
	}
	f =p*w*s*(1 - d/100.0);
	cout<<"freight ="<<f<<endl;
	return 0;
}
